Kujan is a village in the administrative district of Gmina Zakrzewo, within Złotów County, Greater Poland Voivodeship, in west-central Poland. Before 1772, the area was part of the Kingdom of Poland
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ee5deda798504274ef804a4abcaf7bea75ff71bc4cbd7d6eb23130ec1defdd. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33ba5694-f63c-4aaa-a707-fab0e1cf4be4.json and https://artists.proofprofile.net/proofs/artist/33ba5694-f63c-4aaa-a707-fab0e1cf4be4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1349efcd30bad7ac7af89300469a04fa25fc239661b728346ad2aaece78779. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES52181642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191dc4c0b4e1ec687a365ad9d6720a7becdaed5382cb977bffbfa1502e709da8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES62110746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2cd9def72fdb284a52cf2f11ba205ea081b260e8672043a998520370a80b95. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN72178332.
Drunk, and I don't wanna go home (Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062a5f7fe820ea4f21b1ce4fe1d19ef97494686a397ffc434f9cd2bce15c6814. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6P2143232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1e34c07fb3a847c0f057b4b485f7edfc222b08686ab8f3a5305830eed5dd76. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEQ2169512.
Two can play that game (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0d11f93613b8595b7797edd575927c74c832e0b695a26db9322162a05200a5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2343103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571f85198d354af84e2cfe6f7ee7f81f307b0484d5c48a796e3f5d76dbbc95ff. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHP2390360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4a31b5ae4d05d7a2b300954c622116fa1b9151e4ecb94b1889b5aaac449133. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFJ2399776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d1f387187f56366699a44091ff3339965038a04d8d38ad983dfc6356febe72. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFK2368393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cff07cdbfb5c219325fb440c3e24e2c09ac5281c8e49d097b052da9d4f456e. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHR2377462.
Sarà perchè ti amo (Funky House Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521b5057c075a6b150df2836fba39e40a114449f3ca288a1836034e6dd0087f2. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2407383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdacc9561b782dff2d2c2e208f50fecdee559cc205e765d176383c5576d2b7763. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2408380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91592341570235406540ebb7fc638eb0b9ad568c4cd4cf113abde11733a7767. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2408391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3797f51e7c6cfe77291af74a50422218f134c3a3a12e5801bfa08755585dc7b2. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2411016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33be205ab24c12c90ae81a54707c7aa74795e2eff43b2c20c10f4ea222927273. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2413007.
Baby don't hurt me (Funky House Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d1c3d4dfb383e0c27cc43e9a103f6eb7514132dbaf87d1936f39e0f3b597d8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2421230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fa10217d639664e47a90e9cb2499499839d91a3446e552a5bfc0d5a3adaad6. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2422031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6ebea37d345b9f00929e5e623db5f3b7cf864abb92a41f3e20ef7923417c6a. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2424624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e06b759e7b8f59c9e836b49f9e8dbf3deec34409722a12047122fc78c2ec39. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2500367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabb135e1bf8f3d0c8e810792269c7f623a0151e30280d1901d13697e8f2c26d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2502084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e32bbdea8bbe70d0aaa2e8d3b6537de16dd5f331d46190a4e950ea7bda9b78. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2510215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6880d450a94e0e5a190e24143c9e0fb341e9d6941bcc8562650051d6769c6932. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2511028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e45e5aa0b9dfb4814ea721280d09c3cbe9a994f10ea76c72ecd6cfc2f71667. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2527363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857d371f082f250c5c0e026efbbb77b26a4cc60e36acca9c0766560f3af6a819. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2529310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ceda982c329c32cfb2d898cbcc9c68f12528c5765d35e042a3f4f9ada41b85a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2535484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1b9fe7386a1835479c7a380a552576a12828cf41aacd739051caf831522c18. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2541928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47ab4a581389e7413b1b0a10f3647e9d9ea8bdb1a906431d770ec016cb2e86c. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2545124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3db01795b5a4c1520423c2f7808cce0033609e0bc72fe1bfde7c10e51ac80a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2552921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d10217e08da022a1ad88ef131d663b08305685baab0fe46687c83de731a318. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2556996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fe028403913690111c7c6e11b5b8e8599f23fa275a3935df23dd0d84aaebea. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2559839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b073c7465ae350a25c7f13620562d805dba2f301c300f1de055e27438aaf8ac. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2564900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb115de830b17b6ba58992c90ccbe5fbb3060773da851b5053704255d47df7e1c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US38Y2584022.